GAZA CITY (CNN) -- A Palestinian militant was killed and another wounded Saturday by an Israeli airstrike, Palestinian sources said, a day after the truce between Hamas and Israel expired.

Israel launched the airstrike against militants attempting to launch rockets from Gaza into Israel, the Palestinian sources said.

A tenuous six-month truce between the Hamas government in Gaza and Israel expired Friday. Under the Egyptian-brokered deal, Hamas agreed to end militant attacks on Israel from Gaza, and Israel agreed to halt raids inside the territory and ease its blockade on humanitarian goods.

In reality, the truce started to break down two months ago. Rocket attacks by militants became more frequent, and Israel resumed airstrikes inside Gaza.